Gatehouseite

General Information:
 Chemical Formula:
Mn++5(PO4)2(OH)4
 Composition:
(Molecular Weight = 532.66 gm)
Manganese 51.57 % Mn
Phosphorus 11.63 % P 
Hydrogen 0.76 % H 
Oxygen 36.04 % O 
 Empirical Formula:
Mn2+5PO42(OH)4
 IMA Status:
Approved IMA
Physical Properties:
 Cleavage:
[???] Good
 Color:
yellow, yellow, or pale orange.
 Density:
3.74
 Diaphaniety:
Transparent
 Hardness:
4 - Fluorite
 Luster:
Adamantine
 Streak:
light yellow
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